Hi Marge,

On Fri, Aug 12, 2022 at 04:43:25PM +0800, margeyang wrote:

From: Marge Yang <redacted>

RMI4 F03 supports the Stick function,
it's designed to support relative packet.
This patch supports the following case.
When relative packet can't be reported completely,
it may miss one byte or two byte.
New Synaptics firmware will report PARITY error.
When timeout error or parity error happens,
RMI4 driver will sends 0xFE command and
ask FW to Re-send stick packet again.

My understanding is that F03 is intended to be a pass-through mechanism
for PS/2-compatible devices. In that spirit all protocol handling and
validation should happen in psmouse driver that attaches to a serio port
provided by F03.

Historically we did not pay attention to parity and frame errors for
PS/2 mice/touchpads (and for keyboards on x86) but we coudl add such
code there. Do we actually observe this with RMI devices? Can RMI
firmware handle this better instead?

Thanks.

-- 
Dmitry